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Cancer Risk for Fingolimod, Natalizumab, and Rituximab in Multiple Sclerosis Patients

Journal article
Authors Peter Alping
Johan Askling
Joachim Burman
Katharina Fink
Anna Fogdell-Hahn
Martin Gunnarsson
Jan Hillert
Annette Langer-Gould
Jan Lycke
Petra Nilsson
Jonatan Salzer
Anders Svenningsson
Magnus Vrethem
Tomas Olsson
Fredrik Piehl
Thomas Frisell
Published in Annals of Neurology
Volume 87
Issue 5
Pages 688-699
ISSN 0364-5134
Publication year 2020
Published at Institute of Neuroscience and Physiology, Department of Clinical Neuroscience
Pages 688-699
Language en
Links doi.org/10.1002/ana.25701
Subject categories Neurosciences, Neurology

Abstract

© 2020 The Authors. Annals of Neurology published by Wiley Periodicals, Inc. on behalf of American Neurological Association. Objective: Novel, highly effective disease-modifying therapies have revolutionized multiple sclerosis (MS) care. However, evidence from large comparative studies on important safety outcomes, such as cancer, is still lacking. Methods: In this nationwide register-based cohort study, we linked data from the Swedish MS register to the Swedish Cancer Register and other national health care and census registers. We included 4,187 first-ever initiations of rituximab, 1,620 of fingolimod, and 1,670 of natalizumab in 6,136 MS patients matched for age, sex, and location to 37,801 non-MS general population subjects. Primary outcome was time to first invasive cancer. Results: We identified 78 invasive cancers among treated patients: rituximab 33 (incidence rate [IR] per 10,000 person-years = 34.4, 95% confidence interval [CI] = 23.7–48.3), fingolimod 28 (IR = 44.0, 95% CI = 29.2–63.5), and natalizumab 17 (IR = 26.0, 95% CI = 15.1–41.6). The general population IR was 31.0 (95% CI = 27.8–34.4). Adjusting for baseline characteristics, we found no difference in risk of invasive cancer between rituximab, natalizumab, and the general population but a possibly higher risk with fingolimod compared to the general population (hazard ratio [HR] = 1.53, 95% CI = 0.98–2.38) and rituximab (HR = 1.68, 95% CI = 1.00–2.84). Interpretation: In this first large comparative study of 3 highly effective MS disease-modifying therapies, no increased risk of invasive cancer was seen with rituximab and natalizumab, compared to the general population. However, there was a borderline-significant increased risk with fingolimod, compared to both the general population and rituximab. It was not possible to attribute this increased risk to any specific type of cancer, and further studies are warranted to validate these findings. ANN NEUROL 2020.

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